Charley, L., & O'Rourke, L. (1916). Opportunities: How to make the most of them (Authorized ed.). Funk & Wagnalls Co.
Lua i Stíl Chicago (17ú heag.)Charley, L., agus Lorenzo O'Rourke. Opportunities: How to Make the Most of Them. Authorized ed. New York: Funk & Wagnalls Co, 1916.
Lua MLA (9ú heag.)Charley, L., agus Lorenzo O'Rourke. Opportunities: How to Make the Most of Them. Authorized ed. Funk & Wagnalls Co, 1916.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.